[css-page-floats] how to measure the distance to edges

[frivoal]

The definition of snap-block (resp. snap-inline) makes it depend on the distance to the start or the end of the block (resp. line) from where the float naturally appears to determine which edge (if any) it should snap to. How that distance is measured is undefined.

It should be the distance from the coordinates of the float-anchor to the edge, but even that may need clarifications:

• Even if we know within the line where the anchor is in the inline direction, where is it in the block direction? On the dominant baseline?

• If the anchor is at a bidi boundary, there can be several places it could end up at depending on how we process it. Should we handle it the same way as atomic inlines (i.e. as a neutral character)? Should we use the bidi property of the elements as if it had not been floated? Something else?

  This is to answer situations like this (*denotes the position of the anchor):
  logical order: latin*HEBREW
  visual order: latin*WERBEH or latinWERBEH*

[frivoal]

live example